Which type of testing is most commonly used to diagnose cystic fibrosis (CF)?

Question

Quizplus · Accepted Answer

Genetic testing is not used to diagnose the homozygous expression of CF. It is diagnosed on the basis of physical manifestations and the results of the sweat chloride test. Positive results are those indicating a high concentration of sodium chloride in the person's sweat (60 to 200 mEq/L or mmol/L) compared with the normal value (5 to 35 mEq/L). Genetic testing by direct sequencing of the CFTR gene is useful for establishing carrier status, identifying affected children prenatally, and, to some degree, predicting disease severity but is not used as primary diagnostic testing.

Which Type of Testing Is Most Commonly Used to Diagnose